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35 Cards in this Set
- Front
- Back
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what are the 4 functions of pulp
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formative- supporting odontoblasts, nutritive- provide vascular supply, sensory-nerve supply for odontoblast, defensive
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what is the primary function of the pulp
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support the odontoblast layer- compared to endosteum of tubular bone
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cells of pulp
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defense cells, adult stem cells, odontoblasts, fibroblasts
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fibroblasts
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most numerous in pul
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adult stem cells
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potential to be odontoblasts, osteoblasts, endothelial cells, fat cells
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defense cells
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macrophages, mast cells, lymphocytes, granulocytes, dendritic cells
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odontoblasts
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usually part of the dentin- physically located in the pulp. postmitotic-no evidence of mitosis- some apoptosis
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2nd class of tissue component
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fiborous matrix
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matrix
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made of type 1(56%) 3(41) and then types 5 and 6. also oxytalan. 5 and 6 are especially in the subodontoblastic layer around the blood vessesls.
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ground substance- 3rd class of tissue
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proteoglycans and glycoprotiens
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proteoglyans
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versican, biglycan, decorin. versican is very large
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glycoprotien
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fibronectin
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what type of connective tissue is not found in the pulp
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fat cells and elastic fibers
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what is the only part of the pulp with proliferative activity
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radicular pulp
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what are the key features of transition from papilla to pulp
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differentiation of odontoblasts, establishment of neurovascular supply, biochemical ct changes
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collagen fibers in the young pulp
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alot of type 3 and small in diameter- highly cross linked
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age related changes
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decrease in cellularity, increase in collagen anddecrease ingag content, decrease in the size of the pulp chamber
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what causes a decrease in the size of the pulp chamber
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increased secondary dentin
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what are the two anatomic divisions of the pulp
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coronal, radicular
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radicular pulp
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most variable part of the pulp= variabilityin presence and number of accessory canals-
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what interferes with the oorderly outgrowth of HERS
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the irregular course of some blood vessels and neerves- causing accessory canals.
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4 regions of coronal pulp
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peripheral odontoblasts, cell poor zone, cell rich zone, central pulp
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peripheral odontoblastic layer
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pseudo-stratified- as many as 8 layers
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cell poor zone- W
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only present after functional loading- contains few cell bodies but does have cell processes, capillaries and unmylenated nerves
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cell rich zone-H
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nerve plexus- raschkow, subodontoblastic cell bodies, apc dendritic, lymphocytes
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radicular pulp
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peripheral layer of odontoblasts but no cell poor or cell rich layers. it has a higher collagen content then coronal pulp
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calcified structures in pulp
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dystrophic and epithelio-mesenchymal interactions
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dystrophic
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calcification of isolated pulp components- anywhere any time
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epithelio- mesenchymal
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can only occur where things that can induce odontoblasts can break off. can be near the root sheat, in the fircation area, can only occur for a limited period after odontogenesis
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orthodentin
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true dentin with dentinal tubules and odontoblasts at the periphery
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regular calcified material
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concentric apposition patterns
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true denticle
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calcified structure with readily identifyable orthodentin
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false denticles
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calcified material that isnt orthodentin
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diffuse calcifications
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multiple small calcified deposits or irregular calcified material- can enlarge to become false denticles
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2 pages missing
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2 pages
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